Hello @atulsharmacse

Hope you are doing well.

For making logo little big you need to add custom CSS.
For that you need to go to Admin Panel / Appearance / Customize / Theme Options / Advanced Options.
In this section you will see a box to add custom CSS.
Here copy and paste below code.

@media only screen and (max-width: 767px) {
	.site-branding {
		text-align:left;
	}
	.custom-logo-link img {
		height: 80px;
		max-width: 300px;
	}
}

Hope this will help to resolve your issue.
Let us know how it goes.

Best Regards!!!